So THESE are the moments that E L James thinks 'capture the spirit' of Fifty Shades Of Grey...

As excitement continues to build over the Fifty Shades of Grey film, fans of the steamy novel will be keen to see which bits of the book make it into the big screen adaptation.

The movie stars Jamie Dornan and Dakota Johnson as lovers Christian Grey and Anastasia Steele and it look like the duo have sizzling chemistry if the saucy bedroom antics from the trailer are anything to go by!

E L James‘ bestselling tome might be known for the sex and S&M aspects of the plot but surprisingly the author herself wouldn’t pick those scenes as her favourites from the fillm.

The writer – whose real name is Erika Leonard – thinks two less sexual moments sum up what Fifty Shades is about.

‘The glider scene and the post-graduation bar scene [are my favourites],’ says Erika, 51.

‘For me those scenes really capture the spirit of the book.’

Interesting! When it came to translating the racier bits to the big screen, Erika was actually rather concerned about the scenes coming across as tasteless.

‘I was most worried about the scenes in the Red Room,’ the author explains. ‘I wanted them to be tasteful and erotic, and that was a journey, but we got there in the end.’

We’ve seen glimpses of Christian‘s infamous Red Room – the boudoir in his house used for his kinky S&M shenanigans – in the Fifty Shades trailer and it looks pretty erotic to us!

Erika worked as a producer on the movie, which is directed by Sam Taylor-Johnson, and it sounds like she was very involved in deciding which scenes of the novel to use.

‘I enjoyed breaking down the book with the screenwriter Kelly Marcel and deciding what should and should not be in the movie,’ says Erika. ‘That was fun – hard work, but fun.’

The Fifty Shades books have a huge global fanbase, so avid readers of the tome will be thrilled to know that the film has stayed true to the original story.

But it turns out that Erika would actually CHANGE some elements of her famous book if she could.

‘Quite a few things [I would write differently], in fact,’ she tells TIME. ‘But the books seem to be so well loved by so many I’ve let all that go…’

Fifty Shades Of Grey hits cinemas on Friday 13 February.

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Anna Francis